Well thats probably because you started a thread on it as opposed to just saying it in an existing match thread for example. I don't see many if any threads started saying a player should retire, maybe they are all deleted.
Well I do remember that
"Federer must retire for his fans"-thread...
Otherwise, fully agree.
I don't understand fans calling for the retirement of their fav player at all, btw. If anything, I understand it often comes from fans being disappointed by a player's bad loss, but there are other ways to express that disappointment than to start a separate thread on it.